522 PEOF. C. H. o'dONOGHUE : REPOKT ON 
with simultaneously, there is always the possibility o£ one species receiving 
two different names, one from the collector who knows the living animal 
and the other from the laboratory worker who has handled only preserved 
material — indeed, it would not be difficult to cite instances of this. That this 
may occur in Australian material is made possible in the case of the paper 
by G. F. Angas on the Nudibranchs of New South Wales (7). This work is 
illustrated by a number of excellent coloured figures, from which I should 
judge a collector would have practically no difficulty in recognizing the 
living forms at once. As no details or figures of the radulae or other internal 
organs are given, however, it would be impossible to recognize a number of 
the species from a collection of preserved material without colour-notes. 
This difficulty may be overcome if the same person woi'ks at the forms 
from the two aspects, or by the co-operation of two individuals. In the 
present case I have been fortunate enough to look through the collection 
with Professor Dakin, who gave me colour-notes, which, while brief, should 
be sufficient to allow of the easy recognition of the living animal. In two 
instances he supplied me with coloured drawings. 
It has already been noted that the Opisthobranchs of Australia are but 
little known, and they would well repay further studj', but it is of the utmost 
importance that when collections are being made adequate colour-notes of 
the living animal should be taken. 
The list of workers who have treated of West Australian forms is very 
limited. The earliest records are those of Cuvier, 1804 (31), who described 
two species of Nudibranchs brought back by Peron from that coast. Quoy 
and Graimard in 1833 (68) described one further species. Sowerby in 1869 
(71) described the shell of a Tectibranch from the Cuming collection in the 
British Museum. In 1876 Abraham (1) described another Nudibranch from 
the British Museum material, and Bergh (12) one from the Cuming collection 
in the British Museum. A species brought back by Dr. Studer in the 
'Gazelle' was described by Bergh in 1880 (22). Kent (M) in 1897 
recorded a single species that actually came from the Abrolhos Islands. 
Lastly, in 1917 Odhner (59) described three further Nudibranchs which were 
brought back by Dr. Mjoberg's Swedish scientific expeditions to Australia in 
1910-13. 
The species recorded therefore are : — 
TECTIBEANCHIATA. 
Tethys 'lAplijsia gigaatea'] (Sowerby), recorded from Swan River. 
NUDIBEANCHIATA. 
Cladohepatica. 
Scyllcea pelagica Linn., recorded by Cuvier from Terre d'Edels. 
Phyllirhoe liclitensteinii Eschscholtz, recorded by Quoy and Gamard from 
Terre d'Edels. 
